Rimuru started from even below 'nameless'. And we've had a proper animation for his slow and long initial growth and learning process.
The main difference, after ep1, is that Rimuru had a very easy and full of OP level-ups cave because/thanks to Veldora.
It's probable Kumo will eventually be OP too, but it feels like the pacing will be a little different.
As of yet, that first ep didn't give me enough to really want to watch ep2.
I'll watch it anyway, but first ep was boring for my tastes.